Operating System (OS)
Which is the layer of a computer system between the hardware and the user program

Operating environment
None
Operating system
System environment

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Operating System (OS)
Addressing structure

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
defines the fundamental method of determining effective operand addresses
None of these

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